On the 21st, at nine A. M. we halted in the midst of sand-hills, amongst which grass grew pretty plentifully. We were a mile west of the wells of el-Guedea, where we found tolerably good water: the heat was greater than on the preceding days and it was increased by a dead calm: we were this day fully occupied in laying in a stock of water. On the 22nd we recommenced our journey, still proceeding northwards; our progress was slow, as the camels browzed by the way on some thorny and half dried plants. The soil was of the same nature as that we had last traversed. At ten in the morning we halted to avoid the heat of the day, and about ten at night broke up our camp, directing our course northward amongst sandy hills till day-light, when we came to a more level soil covered with white gravel. On the 23rd, at nine in the morning, we suspended our progress. Some pieces of camel’s flesh dried in the sun were boiled for our dinner, but proved as hard as wood. The same evening at nine, we broke up, and, after proceeding northward for three hours, turned to the N. N. W. over a level soil, without any vegetation, and overspread with small gravel. On the 24th, at eleven in the morning, the heat being insufferable, we halted under our tent till it moderated, drinking a little dokhnou; and, about four in the afternoon, after having eaten some rice boiled with the flesh of the camel, we again advanced, bearing N. N. W. till sunset, when we turned northward to cross a chain of low sand-hills on which some grass grows. I learnt from my comrades that the Moors of el-Harib come as far as this place in the rainy seasons to pasture their flocks. We continued our journey till two in the morning, over a hard gravelly soil and some hills of loose sand; after which we halted till dawn, lying down beside our camels to rest. On each side of the place where we stopped were great rocks of granite, amongst which were seen some miserable plants of _mimosa ferruginea_.